The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 2006
Filed:
Dec. 12, 2001
Xiaohu You, Jiangsu, CN;
Yan Zhang, Jiangsu, CN;
Ling Wang, Jiangsu, CN;
Liangcheng Jiang, Jiangsu, CN;
Shixin Cheng, Jiangsu, CN;
Xiaohu You, Jiangsu, CN;
Yan Zhang, Jiangsu, CN;
Ling Wang, Jiangsu, CN;
Liangcheng Jiang, Jiangsu, CN;
Shixin Cheng, Jiangsu, CN;
Abstract
An automatic frequency correction (AFC) apparatus used for CDMA multipath fading channels comprises a frequency-offset evaluator, an automatic frequency correction loop filter and a carrier frequency adjuster. The present invention provides a 'multipath energy window' designing method for the non-determinacy of multipath signals in mobile communication environment. Frequency-offset information can be extracted from the multipath energy window by a simple calculation and evaluated by a maximal SNR weight process. This invention also provides a step-variable accumulation adjusting method and greatly improves the response speed of the AFC apparatus as compared with a conventional loop filter, whereby supplies better AFC required for CDMA mobile terminals.